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CALIFORNIA
<br />Water Boards
<br />EDMUND G. BROWN JR.
<br />GOVERNOR
<br />MATTHEW RODRIOUEZ
<br />SECRETARY FOR
<br />ENVIRONMENTAL PROTECTION
<br />Central Valley Regional Water Quality Control Board
<br />26 June 2018
<br />Bob Long
<br />Sierra Lumber Manufacturing Inc.
<br />P.O. Box 6216
<br />Stockton, CA 95202
<br />itCkyloelt."
<br />JUN 28 20/84.44,
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<br />WORK PLAN RESPONSE, SIERRA LUMBER CASE 1 & CASE 2,375 W. HAZELTON AVENUE,
<br />STOCKTON, SAN JOAQUIN COUNTY, CASE# 390257 & 391168
<br />Central Valley Regionai Water Quality Control Board (Central Valley Water Board) staff reviewed the
<br />Soil-Vapor Investigation Work Plan (Work Plan) dated 13 June 2018, submitted on your behalf by
<br />Advanced GeoEnvironmental Inc (AGE) for the Sierra Lumber Case 2 unauthorized petroleum release
<br />at 375 Hazelton Avenue in Stockton (Site). In the Work Plan, AGE proposes to install a single soil
<br />vapor sampling well (SV-1), adjacent to both the former underground storage tank (UST) location and
<br />closest Site structure, as detailed below.
<br />Well Location Total
<br />Depth
<br />(ft bgs)
<br />Soil Sampling Vapor Sampling
<br />Depth
<br />(ft bgs)
<br />Analysis Depth
<br />(ft bgs)
<br />Analysis
<br />SV-1 Near
<br />MW-15 . 65 5
<br />TPHg, BTEX, MTBE,
<br />DIPE, TAME, ETBE
<br />TBA, 1,2-DCA, EDB' ,
<br />naphthalene
<br />6.25-6.5
<br />TPHg, BTEX,
<br />naphthalene,
<br />IPA, oxygen
<br />TPHg=total petroleum hydrocarbons as gasoline; BTEX=benzene, toluene, ethylbenzene, xylenes; MTBE=methyl tert butyl
<br />ether; DIPE=di-isopropyl ether; TAME=tert amyl methyl ether; ETBE=ethyl tert butyl ether; TBA=tert butyl alcohol; 1,2-
<br />DCA=1,2-dichloroethane; EDB=ethylene dibromide; IPA=isopropyl alcohol (leak detection compound)
<br />Central Valley Water Board staff concurs with the proposed scope of work with the following
<br />comments:
<br />As an additional quality control measure, a shroud should be utilized during soil vapor
<br />sampling. Please place a shroud over the sampling equipment, and leak detection compound
<br />under the shroud. The concentration of leak detection compound under the shroud should be
<br />quantified for comparison to that reported in the collected soil vapor sample.
<br />In the Work Plan, AGE states that the vapor sampling probe will be placed at the bottom of the
<br />borehole, with sand placed from 5 to 6.5 feet bgs. Per the Department of Toxic Substances
<br />Control's (DTSC's) July 2015 joint-agency guidance document Advisory— Active Soil Gas
<br />Investigations, "Place the probe tip midway in the sand pack... with at least six inches of sand
<br />above and below the probe tip". As such, please center the probe vertically within the sand
<br />pack.
<br />By 19 October 2018, please submit a Soil Vapor Report which details the completion of the
<br />above scope of work and the resultant findings. As part of the Soil Vapor Report, please
<br />include an evaluation of both Case 1 (Case #390257) and Case 2 (Case #391168) Site
<br />conditions as compared to Low Threat Underground Storage Tank Case Closure Policy
<br />(LTCP) criteria. In this evaluation, please address both cases, and include for each a detailed
<br />KARL E. LONOLEY ScD, P.E., CHAIR I PAMELA C. CREEDON FE., BCEE, EXECUTIVE OFFICER
<br />11020 Sun Center Drive #200, Rancho Cordova, CA 95670 I www.waterboards.ca .govicentralvalley
<br />Cp RECYCLED PAPER
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